U.S. patent number 10,410,987 [Application Number 15/619,526] was granted by the patent office on 2019-09-10 for display device for facilitating alignment of a pad of a display panel and an element mounted thereon.
This patent grant is currently assigned to Samsung Display Co., Ltd.. The grantee listed for this patent is Samsung Display Co., Ltd.. Invention is credited to Joonsam Kim, Sujeong Kim, Daegeun Lee, Hanho Park, Sangwon Yeo.
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United States Patent |
10,410,987 |
Kim , et al. |
September 10, 2019 |
Display device for facilitating alignment of a pad of a display
panel and an element mounted thereon
Abstract
A display device including a display panel including a base
layer, a circuit layer disposed on the base layer, and a pad part
having a plurality of pads disposed on the base layer; and a
driving chip disposed on the pad part and including a plurality of
chip pads. The plurality of pads include a first pad having a
smaller area than a corresponding chip pad among the plurality of
chip pads and a second pad electrically connected to the circuit
layer.
Inventors: |
Kim; Sujeong (Asan-si,
KR), Park; Hanho (Yongin-si, KR), Yeo;
Sangwon (Cheonan-si, KR), Lee; Daegeun
(Hwaseong-si, KR), Kim; Joonsam (Hwaseong-si,
KR) |
Applicant: |
Name |
City |
State |
Country |
Type |
Samsung Display Co., Ltd. |
Yongin-si |
N/A |
KR |
|
|
Assignee: |
Samsung Display Co., Ltd.
(Yongin-si, KR)
|
Family
ID: |
59676975 |
Appl.
No.: |
15/619,526 |
Filed: |
June 11, 2017 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20180040576 A1 |
Feb 8, 2018 |
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Foreign Application Priority Data
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|
|
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Aug 2, 2016 [KR] |
|
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10-2016-0098644 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H01L
24/06 (20130101); H01L 27/3276 (20130101); H01L
51/0097 (20130101); H01L 27/323 (20130101); H01L
27/3255 (20130101); G02F 1/13458 (20130101); H05K
1/111 (20130101); H05K 2201/09409 (20130101); H01L
2224/06132 (20130101); H01L 2251/5338 (20130101); H01L
2924/12044 (20130101); G06F 3/044 (20130101); H05K
2201/10128 (20130101); H01L 2224/0217 (20130101); H01L
2224/0605 (20130101); H01L 2224/0603 (20130101) |
Current International
Class: |
H01L
23/00 (20060101); H01L 51/00 (20060101); H01L
27/32 (20060101); G02F 1/1345 (20060101); G06F
3/044 (20060101); H05K 1/11 (20060101) |
Field of
Search: |
;257/40 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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2957951 |
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Dec 2015 |
|
EP |
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10-2004-0052578 |
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Apr 2004 |
|
KR |
|
20070007633 |
|
Jan 2007 |
|
KR |
|
10-1399973 |
|
Jun 2014 |
|
KR |
|
10-2015-0144907 |
|
Dec 2015 |
|
KR |
|
10-2016-0002151 |
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Jan 2016 |
|
KR |
|
Other References
Extended European Search Report dated Jan. 10, 2018, issued in the
European Patent Application No. 17184348.5. cited by
applicant.
|
Primary Examiner: Ho; Anthony
Assistant Examiner: Hoque; Mohammad M
Attorney, Agent or Firm: H.C. Park & Associates, PLC
Claims
What is claimed is:
1. A display device comprising: a display panel comprising a base
layer, a circuit layer disposed on the base layer, and a pad part
comprising a plurality of pads disposed on the base layer; and a
driving chip disposed on the pad part and comprising a plurality of
chip pads, wherein the plurality of pads comprise: a first pad
having a smaller area than a corresponding chip pad among the
plurality of chip pads; and a second pad electrically connected to
the circuit layer.
2. The display device of claim 1, wherein the plurality of pads are
arranged in an M.times.N matrix form, where each of M and N are
integers of 1 or more.
3. The display device of claim 2, wherein the first pad is disposed
in an area where a second row to an M-1th row and a second column
to an N-1 column overlap.
4. The display device of claim 1, wherein the second pad has an
area equal to or greater than an area of a corresponding chip pad
among the plurality of chip pads.
5. The display device of claim 1, wherein each of the plurality of
chip pads has a first width in a first direction and a second width
in a second direction intersecting the first direction; and the
first pad has a third width in the first direction and a fourth
width in the second direction.
6. The display device of claim 5, wherein the first width is
greater than the third width.
7. The display device of claim 5, wherein the second width is
greater than the fourth width.
8. The display device of claim 1, wherein each of the pads and the
chip pads has a parallelogram shape.
9. The display device of claim 1, wherein each of the pads and the
chip pads has a rectangular shape.
10. The display device of claim 1, wherein the base layer comprises
a transparent flexible substrate.
11. The display device of claim 1, wherein the first pad is
electrically separated from the circuit layer.
12. The display device of claim 1, wherein the first pad is
electrically connected to the circuit layer.
13. The display device of claim 1, wherein at least one alignment
area is defined in the pad part and the first pad is disposed in
the alignment area.
14. The display device of claim 13, further comprising a plurality
of the first pads and the second pads, and the first pads are
disposed in the alignment area and the second pads are disposed in
a periphery of the alignment area.
15. A display device comprising: a display panel comprising a
plurality of pads arranged in an M.times.N matrix form, where each
of M and N are integers of 1 or more; and a driving chip comprising
a plurality of chip pads electrically coupled with the plurality of
pads, wherein the plurality of pads comprise first pads having a
smaller area than a corresponding chip pad among the plurality of
chip pads and second pads having an area equal to or larger than an
area of a corresponding chip pad among the plurality of chip
pads.
16. The display device of claim 15, wherein the second pads are
disposed in a first row, an Mth row, a first column, and an Nth
column, and the first pads and the second pads are disposed in an
area where a second row to an M-1th row and a second column to an
N-1th column overlap.
17. The display device of claim 15, wherein: the chip pads have a
first width in a first direction and a second width in a second
direction intersecting the first direction; the first pad has a
third width in the first direction and a fourth width in the second
direction; and the first width is greater than the third width or
the second width is greater than the fourth width.
18. A display device comprising: a base layer; a circuit layer
disposed on the base layer; a pad part electrically connected to
the circuit layer, disposed on the base layer, and comprising at
least one alignment area and a connection area defined on a flat
surface; and a driving chip disposed on the pad part and comprising
a plurality of chip pads electrically connected to the circuit
layer through the pad part, wherein: the pad part comprises first
pads disposed in the alignment area, each first pad having a
smaller area than a corresponding chip pad among the plurality of
chip pads and second pads disposed in the connection area.
19. The display device of claim 18, wherein the alignment area is
defined as being surrounded by the connection area.
20. The display device of claim 18, wherein the plurality of chip
pads have larger areas than the first pads and have smaller areas
than the second pads.
Description
CROSS-REFERENCE TO RELATED APPLICATION
This application claims priority from and the benefit of Korean
Patent Application No. 10-2016-0098644, filed on Aug. 2, 2016,
which is hereby incorporated by reference for all purposes as if
fully set forth herein.
BACKGROUND
Field
Exemplary embodiments relate to a display device. More
particularly, exemplary embodiments relate to a display device
including a pad where a driving chip is mounted.
Discussion of the Background
An electronic device, such as a smartphone, a digital camera, a
notebook computer, a navigation system, and a television, each of
which provides images, includes a display panel for displaying an
image. Generally, thin and light flat panel display panels are
widely used for the display panel, and the flat panel display panel
includes a liquid crystal display panel, an organic light emitting
display panel, a plasma display panel, and an electrophoretic
display panel. Recently, foldable display devices folded into a
specific shape or bending flexible display devices are under
development. Since the foldable and flexible display device is thin
and light and does not break, it may be applied not only to IT
related products but also to clothes or paper media.
The above information disclosed in this Background section is only
for enhancement of understanding of the background of the inventive
concept, and, therefore, it may contain information that does not
form the prior art that is already known in this country to a
person of ordinary skill in the art.
SUMMARY
Exemplary embodiments provide a display device for facilitating the
alignment measurement of a pad of a display panel and an element
mounted on the pad.
Additional aspects will be set forth in the detailed description
which follows, and, in part, will be apparent from the disclosure,
or may be learned by practice of the inventive concept.
An exemplary embodiment of the inventive concept discloses a
display device including: a display panel including a base layer, a
circuit layer disposed on the base layer, and a pad part having a
plurality of pads disposed on the base layer; and a driving chip
disposed on the pad part and including a plurality of chip pads,
wherein the plurality of pads include a first pad having a smaller
area than a corresponding chip pad among the plurality of chip pads
and a second pad electrically connected to the circuit layer.
The plurality of pads may be arranged in an M.times.N matrix
form.
The first pad may be disposed in an area where a second row to an
M-1th row and a second column to an N-1 column overlap.
The second pad may have an area equal to or larger than an area of
a corresponding chip pad among the plurality of chip pads.
Each of the plurality of chip pads may have a first width in a
first direction and a second width in a second direction
intersecting the first direction; and the first pad has a third
width in the first direction and a fourth width in the second
direction.
The first width may be larger than the third width.
The second width may be larger than the fourth width.
Each of the plurality of pads and the plurality of chip pads may
have a parallelogram shape.
Each of the plurality of pads and the plurality of chip pads may
have a rectangular shape.
The base layer may be a transparent flexible substrate.
The first pad may be electrically separated from the circuit
layer.
The first pad may be electrically connected to the circuit
layer.
At least one alignment area may be defined in the pad part and the
first pad may be disposed in the alignment area.
Each of the first pad and the second pad may be provided in plural,
and the plurality of first pads may be disposed in the alignment
area and the plurality of second pads may be disposed in a
periphery of the alignment area.
An exemplary embodiment of the inventive concept discloses a
display device including: a display panel including a plurality of
pads arranged in an M.times.N matrix form; and a driving chip
including a plurality of chip pads electrically coupled with the
plurality of pads, wherein the plurality of pads include first pads
having a smaller area than a corresponding chip pad among the
plurality of chip pads and second pads having an area equal to or
larger than an area of a corresponding chip pad among the plurality
of chip pads.
The second pads may be disposed in a first row, an Mth row, a first
column, and an Nth column, and the first pads and the second pads
may be disposed in an area where a second row to an M-1th row and a
second column to an N-1th column overlap.
The plurality of chip pads may have a first width in a first
direction and a second width in a second direction intersecting the
first direction and the first pad may have a third width in the
first direction and a fourth width in the second direction, wherein
the first width is larger than the third width or the second width
is larger than the fourth width.
An exemplary embodiment of the inventive concept discloses a
display device including: a base layer; a circuit layer disposed on
the base layer; a pad part electrically connected to the circuit
layer, disposed on the base layer, and having at least one
alignment area and a connection area defined on a flat surface; and
a driving chip disposed on the pad part and including a plurality
of chip pads electrically connected to the circuit layer through
the pad part, wherein the pad part is disposed in the alignment
area and includes first pads having a smaller area than a
corresponding chip pad among the plurality of chip pads and second
pads disposed in the connection area.
The alignment area may be defined as being surrounded by the
connection area.
The plurality of chip pads may have larger areas than the first
pads and have smaller areas than the second pads.
The foregoing general description and the following detailed
description are exemplary and explanatory and are intended to
provide further explanation of the claimed subject matter.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings, which are included to provide a further
understanding of the inventive concept, and are incorporated in and
constitute a part of this specification, illustrate exemplary
embodiments of the inventive concept, and, together with the
description, serve to explain principles of the inventive
concept.
FIG. 1 is a perspective view of a display device according to an
exemplary embodiment of the inventive concept.
FIG. 2 is a sectional view of a display device according to an
exemplary embodiment of the inventive concept.
FIG. 3 is a sectional view of a display module according to an
exemplary embodiment of the inventive concept.
FIG. 4A is a plan view of a display device according to an
exemplary embodiment of the inventive concept.
FIG. 4B is an equivalent circuit diagram of a pixel according to an
exemplary embodiment of the inventive concept.
FIGS. 4C and 4D are partial sectional views of a display panel
according to an embodiment of the inventive concept;
FIG. 5A is a plan view of a chip pad part of a driving chip
according to an exemplary embodiment of the inventive concept.
FIG. 5B is a plan view of a pad part according to an exemplary
embodiment of the inventive concept.
FIG. 5C is a plan view of a pad part according to an exemplary
embodiment of the inventive concept.
FIG. 5D is a sectional view taken along a line X-X' of FIG. 5B.
FIG. 5E is a sectional view taken along a line Y-Y' of FIG. 5B.
FIG. 5F is a sectional view taken along a line Y-Y' of FIG. 5B.
FIG. 5G is a sectional view illustrating a state in which a pad
part and a driving chip are coupled to each other.
FIG. 6 is an enlarged plan view illustrating a part of a display
device according to an exemplary embodiment of the inventive
concept.
FIG. 7A and FIG. 7B are schematic views illustrating an alignment
measurement method.
FIG. 8A is an enlarged plan view illustrating a part of a display
device according to an exemplary embodiment of the inventive
concept.
FIG. 8B is an enlarged plan view illustrating a part of a display
device according to an exemplary embodiment of the inventive
concept.
FIG. 8C is an enlarged plan view illustrating a part of a display
device according to an exemplary embodiment of the inventive
concept.
FIG. 8D is an enlarged plan view illustrating a part of a display
device according to an exemplary embodiment of the inventive
concept.
FIG. 9A is a plan view of a pad part according to an exemplary
embodiment of the inventive concept.
FIG. 9B is a plan view of a pad part according to an exemplary
embodiment of the inventive concept.
DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS
In the following description, for the purposes of explanation,
numerous specific details are set forth in order to provide a
thorough understanding of various exemplary embodiments. It is
apparent, however, that various exemplary embodiments may be
practiced without these specific details or with one or more
equivalent arrangements. In other instances, well-known structures
and devices are shown in block diagram form in order to avoid
unnecessarily obscuring various exemplary embodiments.
In the accompanying figures, the size and relative sizes of layers,
films, panels, regions, etc., may be exaggerated for clarity and
descriptive purposes. Also, like reference numerals denote like
elements.
When an element or layer is referred to as being "on," "connected
to," or "coupled to" another element or layer, it may be directly
on, connected to, or coupled to the other element or layer or
intervening elements or layers may be present. When, however, an
element or layer is referred to as being "directly on," "directly
connected to," or "directly coupled to" another element or layer,
there are no intervening elements or layers present. For the
purposes of this disclosure, "at least one of X, Y, and Z" and "at
least one selected from the group consisting of X, Y, and Z" may be
construed as X only, Y only, Z only, or any combination of two or
more of X, Y, and Z, such as, for instance, XYZ, XYY, YZ, and ZZ.
Like numbers refer to like elements throughout. As used herein, the
term "and/or" includes any and all combinations of one or more of
the associated listed items.
Although the terms first, second, etc. may be used herein to
describe various elements, components, regions, layers, and/or
sections, these elements, components, regions, layers, and/or
sections should not be limited by these terms. These terms are used
to distinguish one element, component, region, layer, and/or
section from another element, component, region, layer, and/or
section. Thus, a first element, component, region, layer, and/or
section discussed below could be termed a second element,
component, region, layer, and/or section without departing from the
teachings of the present disclosure.
Spatially relative terms, such as "beneath," "below," "lower,"
"above," "upper," and the like, may be used herein for descriptive
purposes, and, thereby, to describe one element or feature's
relationship to another element(s) or feature(s) as illustrated in
the drawings. Spatially relative terms are intended to encompass
different orientations of an apparatus in use, operation, and/or
manufacture in addition to the orientation depicted in the
drawings. For example, if the apparatus in the drawings is turned
over, elements described as "below" or "beneath" other elements or
features would then be oriented "above" the other elements or
features. Thus, the exemplary term "below" can encompass both an
orientation of above and below. Furthermore, the apparatus may be
otherwise oriented (e.g., rotated 90 degrees or at other
orientations), and, as such, the spatially relative descriptors
used herein interpreted accordingly.
The terminology used herein is for the purpose of describing
particular embodiments and is not intended to be limiting. As used
herein, the singular forms, "a," "an," and "the" are intended to
include the plural forms as well, unless the context clearly
indicates otherwise. Moreover, the terms "comprises," "comprising,"
"includes," and/or "including," when used in this specification,
specify the presence of stated features, integers, steps,
operations, elements, components, and/or groups thereof, but do not
preclude the presence or addition of one or more other features,
integers, steps, operations, elements, components, and/or groups
thereof.
Various exemplary embodiments are described herein with reference
to sectional illustrations that are schematic illustrations of
idealized exemplary embodiments and/or intermediate structures. As
such, variations from the shapes of the illustrations as a result,
for example, of manufacturing techniques and/or tolerances, are to
be expected. Thus, exemplary embodiments disclosed herein should
not be construed as limited to the particular illustrated shapes of
regions, but are to include deviations in shapes that result from,
for instance, manufacturing. The regions illustrated in the
drawings are schematic in nature and their shapes are not intended
to illustrate the actual shape of a region of a device and are not
intended to be limiting.
Unless otherwise defined, all terms (including technical and
scientific terms) used herein have the same meaning as commonly
understood by one of ordinary skill in the art to which this
disclosure is a part. Terms, such as those defined in commonly used
dictionaries, should be interpreted as having a meaning that is
consistent with their meaning in the context of the relevant art
and will not be interpreted in an idealized or overly formal sense,
unless expressly so defined herein
FIG. 1 is a perspective view of a display device according to an
exemplary embodiment of the inventive concept.
Referring to FIG. 1, a flat flexible display device is shown as an
example of a display device DD. However, the inventive concept may
also relate to a foldable display device, a rollable display
device, or a bended display device, and is not particularly
limited.
Additionally, although a flexible display device is shown in an
illustrated exemplary embodiment, the inventive concept is not
limited thereto. The display device DD according to an illustrated
exemplary embodiment may be a flat rigid display device or a bent
rigid display device. The display device DD may be used for small
and medium-sized electronic devices, such as mobile phones,
tablets, car navigations, game consoles, and smart watches, in
addition to large-sized electronic devices, such as televisions and
monitors.
The display device DD may include a display surface IS where an
image IM is displayed, which is parallel to a surface defined by a
first direction DR1 and a second direction DR2. The display surface
IS of the display device DD may include a plurality of areas. The
display device DD may include a display area DD-DA where an image
IM is displayed and a non-display area DD-NDA adjacent to the
display area DD-DA. The non-display area DD-NDA is an area where no
image is displayed.
FIG. 1 illustrates a vase as one example of the image IM. As one
example, the display area DD-DA may have a rectangular form. The
non-display area DD-NDA may surround the display area DD-DA.
However, the inventive concept is not limited thereto, and a form
of the display area DD-DA and a form of the non-display area DD-NDA
may be designed relatively.
FIG. 2 is a sectional view of a display device DD according to an
exemplary embodiment of the inventive concept. FIG. 2 shows a
section defined by a second direction DR2 and a third direction
DR3.
As shown in FIG. 2, the display device DD includes a protective
film PM, a display module DM, an optical member LM, a window WM, a
first adhesive member AM1, a second adhesive member AM2, and a
third adhesive member AM3. The display module DM is disposed
between the protective film PM and the optical member LM. The
optical member LM is disposed between the display module DM and the
window WM. The first adhesive member AM1 couples the display module
DM and the protective film PM, the second adhesive member AM2
couples the display module DM and the optical member LM, and the
third adhesive member AM3 couples the optical member LM and the
window WM.
The protective film PM protects the display module DM. The
protective film PM provides a first outer surface OS-L exposed to
the outside and provides an adhesive surface adhering to the first
adhesive member AM1. The protective film PM prevents external
moisture from penetrating the display module DM and absorbs
external impact.
The protective film PM may include a plastic film as a base
substrate. The protective film PM may include a plastic film
including one selected from the group consisting of
polyethersulfone (PES), polyacrylate, polyetherimide (PEI),
polyethylenenaphthalate (PEN), polyethyleneterephthalate (PET),
polyphenylene sulfide (PPS), polyarylate, polyimide (PI),
polycarbonate (PC), poly(arylene ethersulfone), and a combination
thereto.
A material constituting the protective film PM is not limited to
plastic resins and may include an organic/inorganic composite
material. The protective film PM may include an inorganic material
filled in the pores of a porous organic layer and an organic layer.
The protective film PM may further include a functional layer
formed at a plastic film. The functional layer may include a resin
layer. The functional layer may be formed through a coating method.
According to an exemplary embodiment of the inventive concept, the
protective film PM may be omitted.
The window WM may protect the display module DM from an external
impact and provide an input surface to a user. The window WM
provides a second outer surface OS-U exposed to the outside and
provides an adhesive surface adhering to the second adhesive member
AM2. The display surface IS shown in FIGS. 1 may be the second
outer surface OS-U.
The window WM may include a plastic film. The window WM may have a
multilayer structure. The window WM may have a multilayer structure
selected from a glass substrate, a plastic film, or a plastic
substrate. The window WM may further include a bezel pattern. The
multilayer structure may be formed through a continuous process or
an adhering process using an adhesive layer.
The optical member LM reduces an external light reflectance. The
optical member LM may include at least a polarizing film. The
optical member LM may further include a phase difference film.
According to an exemplary embodiment of the inventive concept, the
optical member LM may be omitted.
The display module DM may include a display panel DP and a touch
detection unit TS. The touch detection unit TS may be directly
disposed on the display panel DP. In this specification, "directly
disposed" means "being formed" through a continuous process,
excluding "attached" through an additional adhesive layer. However,
this is exemplary, and the touch detection unit TS may be disposed
on the thin film sealing layer TFE after being formed on a film or
a substrate.
The display panel DP generates the image 1M (see FIG. 1)
corresponding to inputted image data. The display panel DP provides
a first display panel surface BS1-L and a second display panel
surface BS1-U facing it in a thickness direction DR3. In an
exemplary embodiment, although the display panel DP is exemplarily
described, the display panel is not limited thereto.
The touch detection unit TS obtains coordinate information of an
external input. The touch detection unit TS may detect an external
input through a capacitance method.
Although not shown separately, the display module DM according to
an exemplary embodiment of the inventive concept may further
include an anti-reflective layer. The anti-reflective layer may
include a color filter or a layer-stacked structure of conductive
layer/insulation layer/conductive layer. The anti-reflective layer
may reduce an external light reflectance by absorbing,
destructive-interfering, or polarizing the light incident from the
outside. The anti-reflective layer may replace a function of the
optical member LM.
Each of the first adhesive member AM1, the second adhesive member
AM2, and the third adhesive member AM3 may be an organic adhesive
layer, such as an Optically Clear Adhesive (OCA) film, Optically
Clear Resin (OCR), or a Pressure Sensitive Adhesive (PSA) film. The
organic adhesive layer may include an adhesive material such as a
polyurethane, polyacrylic, polyester, polyepoxy, and polyvinyl
acetate.
FIG. 3 is a sectional view of a display module DM according to an
exemplary embodiment of the inventive concept.
Referring to FIG. 3, the display module DM may include a display
panel DP and a touch detection unit TS. FIG. 3 illustrates an
organic light emitting display panel as one example of the display
panel DP. However, the inventive concept is not limited thereto,
and the display panel DP may be a liquid crystal display panel, a
plasma display panel, and an electrophoretic display panel.
The display panel DP includes a base layer SUB, a circuit layer
DP-CL disposed on the base layer SUB, a light emitting device layer
DP-OLED, and a thin film sealing layer TFE.
The base layer SUB may include at least one plastic film. The base
layer SUB may include a plastic substrate, a glass substrate, a
metal substrate, or an organic/inorganic composite material
substrate as a transparent flexible substrate. The plastic
substrate may include at least one of acrylic resin, methacrylic
resin, polyisoprene, vinyl resin, epoxy resin, urethane resin,
cellulose resin, siloxane-based resin, polyimide-based resin,
polyamide-based resin, and perylene resin. The term "transparent"
means that it has a light transmittance of more than 0% and
includes translucency.
The circuit layer DP-CL may include a plurality of insulation
layers, a plurality of conductive layers, and a semiconductor
layer. The plurality of conductive layers of the circuit layer
DP-CL may constitute signal lines or a control circuit of a
pixel.
The light emitting device layer DP-OLED includes organic light
emitting diodes.
The thin film sealing layer TFE seals the light emitting device
layer DP-OLED. The thin film sealing layer TFE includes a plurality
of inorganic thin films and at least one organic thin film
therebetween. The inorganic thin films protect the light emitting
device layer DP-OLED from moisture/oxygen and the organic thin film
protects the light emitting device layer DP-OLED from a foreign
material such as dust particles.
The touch detection unit TS includes touch sensors and touch signal
lines. The touch sensors and the touch signal lines may have a
single or multilayer structure. The touch sensors and the touch
signal lines may include indium tin oxide (ITO), indium zinc oxide
(IZO), zinc oxide (ZnO), indium tin zinc oxide (ITZO), PEDOT, metal
nano wire, and graphene. The touch sensors and the touch signal
lines may include a metal layer, for example, molybdenum, silver,
titanium, copper, aluminum, or an alloy thereof. The touch sensors
and the touch signal lines may have the same or different layer
structure.
FIG. 4A is a plan view of a display device DD according to an
exemplary embodiment of the inventive concept.
Referring to FIG. 4A, the display device DD may include a display
panel DP, a driving chip IC, and a printed circuit board FPC.
The display panel DP includes a display area DA and a non-display
area NDA on a plane. The display area DA and the non-display area
NDA of the display panel DP correspond to the display area DD-DA
(see FIG. 1) and the non-display area DD-NDA (see FIG. 1) of the
display device DD, respectively. The display area DA and the
non-display area NDA of the display panel DP may not be necessarily
identical to the display area DD-DA (see FIG. 1) and the
non-display area DD-NDA (see FIG. 1) of the display area DD, and
may vary according to a structure/design of the display panel
DP.
The display panel DP includes a plurality of pixels PX. An area
where the pixels PX are disposed may be defined as the display area
DA. In an exemplary embodiment, the non-display area NDA may be
defined along the outline of the display area DA.
The display panel DP includes gate lines GL, data lines DL, light
emitting lines EL, a control signal line SL-D, an initialization
voltage line SL-Vint, a voltage line SL-VDD, a first pad part PAD1,
and a second pad part PAD2.
The gate lines GL are respectively connected to corresponding
pixels PX among the plurality of pixels PX, and the data lines DL
are respectively connected to corresponding pixels PX among the
plurality of pixels PX. Each of the light emitting lines EL may be
arranged parallel to a corresponding gate line among the gate lines
GL. The control signal line SL-D may provide control signals to the
gate driving circuit GDC. The initialization voltage line SL-Vint
may provide an initialization voltage to the plurality of pixels
PX. The voltage line SL-VDD may be connected to the plurality of
pixels PX and provide a first voltage to them. The voltage line
SL-VDD may include a plurality of lines extending in the first
direction DR1 and a plurality of lines extending in the second
direction DR2.
The gate driving circuit GDC where the gate lines GL and the light
emitting lines EL are connected may be disposed at one side of the
non-display area NDA. Some of the gate lines GL, the data lines DL,
the light emitting lines EL, the control signal line SL-D, the
initialization voltage line SL-Vint, and the voltage line SL-VDD
are disposed at the same layer and some of them are disposed at
different layers.
The first pad part PAD1 may extend from the end of the data lines
DL to be connected to a data wiring part DL-L disposed in the
non-display area NDA. The second pad part PAD2 may be connected to
the ends of the control signal line SL-D, the initialization
voltage line SL-Vint, and the voltage line SL-VDD.
The driving chip IC may be electrically coupled to the first pad
part PAD1. The driving chip IC may provide a driving signal and
data as electrical signals to the pixels PX of the display area DA.
The driving chip IC and the first pad part PAD1 may be electrically
connected to each other through an Anisotropic Conductive Film
(ACF). However, the inventive concept is not limited thereto, and
the driving chip IC and the first pad part PAD1 may be bonded
through a solder bump. The driving chip IC may be mounted on the
display panel DP through a Chip On Plastic (COP) method or a Chip
In Glass (COG) method.
The printed circuit board FPC may be electrically coupled to the
second pad part PAD2. The printed circuit board FPC may have a
flexible property. After being coupled to the display panel DP, the
printed circuit board FPC may be bent to the back surface of the
display panel DP. The printed circuit board FPC may deliver a
control signal for controlling the drive of the display panel DP.
The printed circuit board FPC and the second pad part PAD2 may be
electrically connected to each other through an ACF.
The circuit layer DP-CL (see FIG. 3) may include a display circuit
layer disposed in the display area DA and non-display circuit
layers disposed in the non-display area NDA. The display circuit
layers may include the gate lines GL disposed in the display area
DA, the data lines DL, the light emitting lines EL, the
initialization voltage line SL-Vint, and circuits in the pixels PX.
The non-display circuit layer may include a gate driving circuit, a
control signal line SL-D, wires connecting the display circuit
layer and the first pad part PAD1, and wires connecting the first
pad part PAD1 and the second pad part PAD2.
FIG. 4B is an equivalent circuit diagram of a pixel PX according to
an exemplary embodiment of the inventive concept.
FIG. 4B exemplarily shows a pixel PX connected to a gate line GL, a
data line DL, and a voltage line SL-VDD. A configuration of the
pixel PX is not limited thereto and may be modified and
implemented.
The pixel PX includes an organic light emitting diode OLED as a
display element. The organic light emitting diode OLED may be a
front-light-emitting-type diode or a rear-light-emitting-type
diode. The pixel PX includes a first transistor TFT1 (or a
switching transistor), a second transistor TFT2 (or a driving
transistor), and a capacitor CAP, as a driving circuit for driving
the organic light emitting diode OLED.
The first transistor TFT1 outputs a data signal applied to the data
line DL in response to a scan signal applied to the gate line GL.
The capacitor CAP charges a voltage corresponding to a data signal
received from the first transistor TFT1.
The second transistor TFT2 is connected to the organic light
emitting diode OLED. The second transistor TFT2 controls a driving
current flowing through the organic light emitting diode OLED in
correspondence to a charge amount stored in the capacitor CAP. The
organic light emitting device OLED may emit light during a turn-on
section of the second transistor TFT2.
FIGS. 4C and 4D are partial sectional views of a display panel DP
according to an exemplary embodiment of the inventive concept.
FIG. 4C illustrates a section of a portion corresponding to the
first transistor TFT1 and the capacitor CAP of the equivalent
circuit shown in FIG. 4B. FIG. 4D illustrates a section of a
portion corresponding to the second transistor TFT2 and the organic
light emitting diode OLED of the equivalent circuit shown in FIG.
4B.
As shown in FIGS. 4C and 4D, a circuit layer DP-CL is disposed on a
base layer SUB. A semiconductor pattern AL1 (hereinafter referred
to as a first semiconductor pattern) of the first transistor TFT1
and a semiconductor pattern AL2 (hereinafter referred to a second
semiconductor pattern) of the second transistor TFT2 are disposed
on the base layer SUB. The first semiconductor pattern AL1 and the
second semiconductor pattern AL2 may be identically or differently
selected from amorphous silicon, polysilicon, and a metal oxide
semiconductor.
Although not shown separately, function layers may be further
disposed on one surface of the base layer SUB. The function layers
include at least one of a barrier layer or a buffer layer. The
first semiconductor pattern AL1 and the second semiconductor
pattern AL2 may be disposed on a barrier layer or a buffer
layer.
A first insulation layer 12 for covering the first semiconductor
pattern AL1 and the second semiconductor pattern AL2 is disposed on
the base layer SUB. The first insulation layer 12 may include an
organic layer and/or an inorganic layer. Especially, the first
insulation layer 12 may include a plurality of inorganic thin
films. The plurality of inorganic thin films may include a silicon
nitride layer and a silicon oxide layer.
A control electrode GE1 (hereinafter referred to as a first control
electrode) of the first transistor TFT1 and a control electrode GE2
(hereinafter referred to as a second control electrode) of the
second transistor TFT2 are disposed on the first insulation layer
12. A first electrode E1 of a capacitor CAP is disposed on the
first insulation layer 12. The first control electrode GE1, the
second control electrode GE2, and the first electrode E1 may be
fabricated according to the same photolithography process as the
gate lines GL (see FIG. 4A). That is, the first electrode E1 may be
formed of the same material, may have the same layer-stacked
structure, and may be disposed on the same layer as the gate lines
GL.
A second insulation layer 14 for covering the first control
electrode GE1, the second control electrode GE2, and the first
electrode E is disposed on the first insulation layer 12. The
second insulation layer 14 may include an organic layer and/or an
inorganic layer. Especially, the second insulation layer 14 may
include a plurality of inorganic thin films. The plurality of
inorganic thin films may include a silicon nitride layer and a
silicon oxide layer.
The data lines DL (see FIG. 4A) may be disposed on the second
insulation layer 14. An input electrode SE1 (hereafter referred to
as a first input electrode) and an output electrode DE1
(hereinafter referred to as a first output electrode) of the first
transistor TFT1 are disposed on the second insulation layer 14. An
input electrode SE2 (hereafter referred to as a second input
electrode) and an output electrode DE2 (hereinafter referred to as
a second output electrode) of the second transistor TFT2 are
disposed on the second insulation layer 14. The first input
electrode SE1 may branch from a corresponding data line among the
data lines DL. The power line PL (see FIG. 4A) may be disposed on
the same layer as the data lines DL. The second input electrode SE2
may branch from the power line PL.
A second electrode E2 of a capacitor CAP is disposed on the second
insulation layer 14. The second electrode E2 may be manufactured
according to the same photolithography process, may be formed of
the same material, may have the same layer-stacked structure, and
may be disposed on the same layer as the data lines DL and the
power line PL.
Each of the first input electrode SE1 and the first output
electrode DE1 is connected to the first semiconductor pattern AL1
through a first through hole CH1 and a second through hole CH2
penetrating the first insulation layer 12 and the second insulation
layer 14. The first output electrode DE1 may be electrically
connected to the first electrode E1. For example, the first output
electrode DE1 may be connected to the first electrode E1 via a
through hole (not shown) penetrating the second insulation layer
14. Each of the second input electrode SE2 and the second output
electrode DE2 is connected to the second semiconductor pattern AL2
through a third penetration hole CH3 and a fourth penetration hole
CH4 penetrating the first insulation layer 12 and the second
insulation layer 14. On the other hand, according to another
exemplary embodiment of the inventive concept, the first transistor
TFT1 and the second transistor TFT may be modified as a bottom gate
structure and implemented as such.
A third insulation layer 16 for covering the first input electrode
SE1, the first output electrode DE1, the second input electrode
SE2, and the second output electrode DE2 is disposed on the third
insulation layer 14. The third insulation layer 16 may include an
organic layer and/or an inorganic layer. Especially, the third
insulation layer 16 may include an organic material for providing a
flat surface.
One of the first insulation layer 12, the second insulation layer
14, and the third insulation layer 16 may be omitted according to a
circuit structure of a pixel. Each of the second insulation layer
14 and the third insulation layer 16 may be defined as an
interlayer insulation layer. The interlayer insulation layer is
disposed between a conductive pattern disposed at a lower part and
a conductive pattern disposed at an upper part on the basis of the
interlayer insulation layer to insulate the conductive
patterns.
The circuit layer DP-CL includes dummy conductive patterns. The
dummy conductive patterns are disposed in the same layer as the
semiconductor patterns AL1 and AL2, the control electrodes GE1 and
GE2, or the output electrodes DE1 and DE2. The dummy conductive
patterns may be disposed in the non-display area NDA (see FIG. 4A).
The dummy conductive patterns will be described in detail
later.
A light emitting element layer DP-OLED is disposed on the third
insulation layer 16. A pixel definition layer PXL and an organic
light emitting diode OLED are disposed on the third insulation
layer 16. An anode AE is disposed on the third insulation layer 16.
The anode AE is connected to the second output electrode DE2 via a
fifth through hole CH5 penetrating the third insulation layer 16.
An opening part OP is defined in the pixel definition layer PXL.
The opening part OP of the pixel definition layer PXL exposes at
least a part of the anode AE.
The light emitting element layer DP-OLED includes a light emitting
area PXA and a non-light emitting area NPXA adjacent to the light
emitting area PXA. The non-light emitting area NPXA may surround
the light emitting area PXA. According to this exemplary
embodiment, the light emitting area PXA is defined corresponding to
the anode AE. However, the light emitting area PXA is not limited
thereto, and it is sufficient if the light emitting region PXA is
defined as an area where light is generated. The light emitting
area PXA may be defined to correspond to a partial area of the
anode AE exposed by the opening part OP.
A hole control layer HCL may be commonly disposed in the light
emitting area PXA and the non-light emitting area NPXA. Although
not shown in the drawing separately, a common layer, such as the
hole control layer HCL, may be commonly formed in the plurality of
pixels PX (see FIG. 4A).
An organic light emitting layer EML is disposed on the hole control
layer HCL. The organic light emitting layer EML may be disposed in
only an area corresponding to the opening part OP. That is, the
organic light emitting layer EML may be divided and formed at each
of the plurality of pixels PX.
An electronic control layer ECL is disposed on the organic light
emitting layer EML. A cathode CE is disposed on the electronic
control layer ECL. The cathode CE is commonly disposed at the
plurality of pixels PX.
Although the patterned organic light emitting layer EML is shown
according to this exemplary embodiment, the organic light emitting
layer EML may be commonly disposed in the plurality of pixels PX.
At this point, the organic light emitting layer EML may generate
white light. Additionally, the organic light emitting layer EML may
have a multilayer structure.
According to this exemplary embodiment, the thin film sealing layer
TFE directly covers the cathode CE. According to an exemplary
embodiment of the inventive concept, a capping layer for covering
the cathode CE may be further disposed. At this point, the thin
film sealing layer TFE directly covers the capping layer.
FIG. 5A is a plan view of a chip pad part IC-PAD of the driving
chip IC (see FIG. 4A) according to an exemplary embodiment of the
inventive concept. FIG. 5B is a plan view of a first pad part PAD1
according to an exemplary embodiment of the inventive concept.
Referring to FIG. 5A, the chip pad part IC-PAD may be provided on a
surface where the driving chip IC (see FIG. 4A) contacts the first
pad part PAD1. The chip pad part IC-PAD may be electrically
connected to circuits inside the driving chip IC (see FIG. 4A).
The chip pad part IC-PAD may include a plurality of chip pads IP,
and the first pad part PAD1 may include a plurality of pads PD.
Each of the plurality of chip pads IP and each of the plurality of
pads PD may face each other in a one-to-one correspondence.
Therefore, the plurality of chip pads IP and the plurality of pads
PD may have the same arrangement.
The plurality of chip pads IP may be arranged in an M.times.N
matrix form. That is, M (M is an integer of 1 or more) chip pads
may be arranged along the first direction DR1, and N (N is an
integer of 1 or more) chip pads may be arranged along the second
direction DR2.
The chip pads IP-C arranged in the middle area CP overlapping the
center of the width of the second direction DR2 among the plurality
of chip pads IP may have a rectangular shape. Although FIG. 5A
shows that only the chip pads IP-C of one column (hereinafter, the
column is referred to as being parallel to the first direction DR1
in the detailed description) have a rectangular shape, the
inventive concept is not limited thereto. For example, the chip
pads IP-C in a plurality of columns may have a rectangular shape in
the middle area CP. The remaining chip pads IP, other than the chip
pads IP-C disposed in the middle area CP, may have a parallelogram
shape.
The chip pads IP arranged facing each other with the chip pads IP-C
therebetween may have a shape symmetrical to each other. In FIG.
5A, the chip pads IP may have a parallelogram shape.
Each of the chip pads IP may have a first area. Each of the chip
pads IP may have a first width WT1 in the first direction DR1 and a
second width WT2 in the second direction DR2. The first area may be
a product of the first width WT1 and the second width WT2.
Referring to FIG. 5B, the plurality of pads PD may be arranged in
an M.times.N matrix form. That is, M (M is an integer of 1 or more)
pads may be arranged along the first direction DR1, and N (N is an
integer of 1 or more) pads may be arranged along the second
direction DR2. In FIG. 5B, M is 3. Although it is shown in FIGS. 5A
and 5B as one example that the number of the plurality of chip pads
IP is equal to the number of the plurality of pads PD, the
inventive concept is not limited thereto. The number of the
plurality of chip pads IP and the number of the plurality of pads
PD may be different.
The pads IP-C arranged in the middle area CP overlapping the center
of the width of the second direction DR2 among the plurality of
pads IP may have a rectangular shape. Although FIG. 5B exemplarily
shows that only the pads PD-C in one column have a rectangular
shape, the inventive concept is not limited thereto. For example,
the pads PD-C in a plurality of columns may have a rectangular
shape in the middle area CP. The remaining pads PD, other than the
pads PD disposed in the middle area CP, may have a parallelogram
shape.
When the base layer SUB (see FIG. 3) includes a plastic film, the
base layer SUB may expand or contract by predetermined processes.
When the base layer SUB (see FIG. 3) expands, an interval between
the pads PD is increased. In the case that the pads PD have a
parallelogram shape, when the driving chip IC is raised higher than
the center of the pads PD and attached, even if an interval between
the pads PD is increased, the chip pads IP of the driving chip IC
may be attached to the pads PD in a one-to-one correspondence.
Further, when the base layer SUB (see FIG. 3) contracts, an
interval between the pads PD is reduced. Whenever the pads PD have
a parallelogram shape, when the driving chip IC is lowered than the
center of the pads PD and attached, even if an interval between the
pads PD is reduced, the chip pads IP of the driving chip IC may be
attached to the pads PD in a one-to-one correspondence.
The plurality of pads PD may include a first pad PD1 and a second
pad PD2. The first pad PD1 may have a second area smaller than a
first area of the second pad PDF2. The second pad PD2 may have a
third area larger than the second area. The third area may be
larger than the first area. That is, the second area of the first
pad PD1<the first area of the chip pad IP<the third area of
the second pad PD2. It is sufficient that the third area of the
second pad PD2 is only larger than the second area, and the third
area may be variously modified. For example, the third area of the
second pad PD2 may be equal to or smaller than the first area of
the chip pad IP.
The first pad PD1 may have a third width WT3 in the first direction
DR1 and a fourth width WT4 in the second direction DR2. The second
pad PD2 may have a fifth width WT5 in the first direction DR1 and a
sixth width WT6 in the second direction DR2. The second area may be
a product of the third width WT3 and the fourth width WT4. The
third area may be a product of the fifth width WT5 and the sixth
width WT6.
An area where the first pad PD1 of the first pad part PAD1 is
disposed is defined as an alignment area ALA and an area where the
second pad PD2 is disposed is defined as a connection area CNA.
Although FIG. 5B exemplarily shows that four first pads PD1 are
disposed in one alignment area ALA, the inventive concept is not
limited thereto. The number of the first pads PD1 disposed in one
alignment area ALA may be one or more. In addition, FIG. 5B
exemplarily shows that two alignment areas ALA are defined in the
first pad part PAD1. However, the inventive concept is not limited
thereto. For example, the number of the alignment areas ALA may be
two or more, or may be one, depending on the size of the display
panel DP (see FIG. 4).
The alignment area ALA may be disposed in the Mth row.
Specifically, the alignment area ALA in FIG. 5A may be arranged in
the third row. The alignment area ALA may be disposed at the
outermost of the plurality of pads PD. The first pad PD1 disposed
in the alignment area ALA may be electrically separated from the
circuit layer DP-CL (see FIG. 3). That is, the first pad PD1 may be
a floating pattern. The first pad PD1 may be used only for
alignment confirmation and not to deliver a predetermined signal.
However, the inventive concept is not limited thereto, and the
first pad PD1 may be electrically connected to the circuit layer
DP-CL.
FIG. 5C is a plan view of a first pad part PAD1-1 according to an
exemplary embodiment of the inventive concept.
When the first pad portion PAD1-1 of FIG. 5C is compared to the
first pad part PAD1 of FIG. 5B, there is a difference in the
position of the alignment area ALA. This will be described below in
more detail.
The first pad part PAD1-1 may include a plurality of pads PD. The
plurality of pads PD may be arranged in an M.times.N matrix form.
That is, M pads may be arranged along the first direction DR1 and N
pads may be arranged along the second direction DR2.
FIG. 5B shows that the alignment area ALA (see FIG. 5B) is disposed
in the Mth row (hereinafter, the row in the detailed description
means that it is parallel to the second direction DR2). However,
the alignment area ALA of FIG. 5C need not be disposed in the Mth
row. More specifically, the alignment area ALA may be arranged in
at least one of the second to M-1th rows. The outermost pads among
the plurality of pads PD all may be the second pads PD2. The
alignment area ALA may be surrounded by the connection area CNA.
Specifically, all areas adjacent to the alignment area ALA may be
the connection area CNA.
If the alignment area ALA is not defined at the outermost, the
alignment measurement may be easier. More specifically, in the case
where the base layer SUB (see FIG. 3) includes at least one plastic
film, the base layer SUB (see FIG. 3) may be bent in the process of
mounting the driving chip IC (see FIG. 3). In the second row to the
M-1th row where the alignment area ALA is arranged, no bending may
occur, and thus, alignment measurement may be easier.
In addition, the alignment area ALA may be arranged in at least one
column among the second column to the N-1th column. Even in this
case, no bending may occur in the second column to the N-1th
column, and thus, alignment measurement may be easier.
FIG. 5D is a sectional view taken along a line X-X' of FIGS. 5B.
FIG. 5E and FIG. 5F are sectional views taken along a line Y-Y' of
FIG. 5B. FIGS. 5D to 5F are sectional views taken along a fourth
direction DR4 parallel to the long side direction of the pads PD
(see FIG. 5B). That is, FIGS. 5D to 5F are sectional views defined
by the fourth direction DR4 and the third direction DR3.
In FIG. 5D, the second pad PD2 may include a plurality of layers.
For example, the second pad PD2 may include a first sub-pad layer
DL-La and a second sub-pad layer PD-S2. The first sub-pad layer
DL-La may extend from the data wiring part DL-L (see FIG. 4A). That
is, the first sub-pad layer DL-La may be disposed on the same layer
as the data wiring part DL-L (see FIG. 4A). The second sub-pad
layer PD-S2 may be connected to the first sub-pad layer DL-La
through a first contact hole CNTa. The first contact hole CNTa
penetrates the third insulation layer 16.
Although FIG. 5D shows that the second pad PD2 is composed of two
layers, the inventive concept is not limited thereto. For example,
the second pad PD2 may be composed of a single layer or may be
formed of three or more layers.
FIG. 5E shows a sectional view of the first pad PD1. The first pad
PD1 may be electrically separated from the circuit layer DP-CL (see
FIG. 3). That is, the first pad PD1 may be a floating pattern.
The first pad PD1 may be disposed on the same layer as the second
sub-pad layer PD-S2 of the second pad PD2 described above with
reference to FIG. 5D. For example, in this exemplary embodiment,
the first pad PD1 and the second sub-pad layer PD-S2 may be
disposed on the third insulation layer 16. Although FIG. 5E shows
that the first pad PD1 is composed of a single layer, the inventive
concept is not limited thereto. For example, the first pad PD1 may
be composed of a plurality of layers.
In FIG. 5F, the first pad PD1 may include a plurality of layers.
For example, the first pad PD1 may include a first sub-pad layer
DL-Lb and a second sub-pad layer PD-S1. The first sub-pad layer
DL-Lb may extend from the data wiring part DL-L (see FIG. 4A). That
is, the first sub-pad layer DL-Lb may be disposed on the same layer
as the data wiring part DL-L (see FIG. 4A). The second sub-pad
layer PD-S1 may be connected to the first sub-pad layer DL-Lb
through a second contact hole CNTb. The second contact hole CNTb
penetrates the third insulation layer 16.
FIGS. 5D and 5F show that a first pad PD1 and a second pad PD2 may
include first sub-pad layers DL-La and DL-Lb, respectively, which
extend from the data wiring part DL-L. However, an exemplary
embodiment of the inventive concept may include the wires shown in
FIG. 4A, or pads electrically connected to the sensing wires
included in the touch sensing unit in addition to the data wiring
part DL-L. For example, it is described that the first pad and the
second pad are electrically connected to a wire (e.g., a gate wire)
disposed on the first insulation layer 12, and include a sub-pad
layer disposed on the first insulation layer 12. In this case, the
uppermost layer (e.g., a sub-pad layer disposed on the third
insulation layer 16) of the first and second pads may be
electrically connected to the sub-pad layer through a contact hole
(not shown) penetrating the second insulation layer 14 and the
third insulation layer 16.
FIG. 5G is a sectional view illustrating a state in which a pad
part and a driving chip are coupled to each other.
FIG. 5G is a sectional view of a connection area CNA and an
alignment area ALA. More specifically, it is a sectional view
illustrating a state in which corresponding chip pads IP are
coupled to the second pad PD2 of FIG. 5D and the first pad PD1 of
FIG. 5E.
In the connection area CNA, the second pad PD2 and the chip pad IP
of the driving chip IC may be coupled by an anisotropic conductive
film EM. In the alignment area ALA, the first pad PD1 and the chip
pad IP of the driving chip IC may be coupled by an anisotropic
conductive film EM. However, the inventive concept is not limited
thereto, and the second pad PD2 and the chip pad IP of the driving
chip IC, and the first pad PD1 and the chip pad IP of the driving
chip IC may be bonded through a solder bump.
In relation to the fourth direction DR4, the length of the second
pad PD2 is greater than that of the first pad PD1. When viewed from
the third direction DR3, the chip pad IP coupled with the second
pad PD2 may be hidden by the second pad PD2 and thus, may be
invisible. However, the chip pad IP coupled with the first pad PD1
has a length in the fourth direction DR4 greater than that of the
first pad PD1. Therefore, when viewed from the third direction DR3,
the position of the chip pad IP coupled with the first pad PD1 may
be checked.
FIG. 6 is an enlarged plan view illustrating a part of a display
device according to an exemplary embodiment of the inventive
concept.
Referring to FIG. 6, a first pad PD1 and a second pad PD2 are shown
by solid lines, and a chip pad IP is shown by a dotted line.
In FIG. 6, the second width WT2 of the chip pad IP, the fourth
width WT4 of the first pad PD1, and the sixth width WT6 of the
second pad PD2 may be equal to each other. The third width WT3 of
the first pad PD1 may be less than the first width WT1 of the chip
pad IP and the fifth width WT5 of the second pad PD2. The first
width WT1 of the chip pad IP may be greater than the third width
WT3 of the first pad PD1 and less than the fifth width WT5 of the
second pad PD2. The fifth width WT5 of the second pad PD2 may be
greater than the first width WT1 of the chip pad IP and the third
width WT3 of the first pad PD1.
According to an exemplary embodiment of the inventive concept, the
width of the exposed chip pad IP may be measured in order to easily
measure whether the position of the chip pad IP corresponds to a
range within an alignment margin. FIGS. 7A and 7B are schematic
views illustrating an alignment measurement method.
FIGS. 7A and 7B illustrate an example of checking whether the
driving chip IC is properly aligned on the display panel DP. Since
the driving chip IC is opaque, it is difficult to confirm whether
or not the alignment of the driving chip IC is correct on the upper
surface of the display panel DP. Therefore, it is possible to test
whether or not the driver IC is properly aligned under the display
panel DP.
Light is emitted to the back surface of the display panel DP by
using a light source LS under the display panel DP. The light
emitted on the back surface of the display panel DP may be
reflected and incident to a measurement device MS. For example, the
measurement device MS may be a device, such as a camera, for
photographing the back surface of the display panel DP. Since the
base layer SUB (see FIG. 3) of the display panel DP is transparent,
alignment may be measured on the back surface of the display panel
DP.
FIG. 7B shows one chip pad IP and one first pad PD1 taken by the
measurement device MS. Since the area of the first pad PD1 is less
than the chip pad IP, the chip pad IP exposed to the periphery of
the first pad PD1 may be observed.
According to an exemplary embodiment of the inventive concept, the
width of the exposed chip pad IP may be measured in order to easily
measure whether the difference in width corresponds to a range
within an alignment margin. For example, the width of the exposed
chip pad IP is measured based on the first pad PD1. In FIG. 7B, the
width of the chip pad IP exposed to one side of the first pad PD1
is measured as a first width DTx, and the width of the chip pad IP1
exposed to the other side of the first pad PD1 is measured as a
second width DTy.
It is possible to measure whether a difference between a value
obtained by dividing the sum of the first width DTx and the second
width (DTy) by two and the first width DTx and a difference between
a value obtained by dividing the sum of the first width DTx and the
second width DTy by two and the second width DTy correspond to a
range within a predetermined alignment margin.
According to an exemplary embodiment of the present invention, it
is possible to easily measure the width of the chip pad IP exposed
based on the first pad PD1 through the rear surface of the display
panel DP. Therefore, the defect detection test process may be
simplified, and the quality may be easily checked. As a result, the
manufacturing yield and product reliability may be improved.
FIG. 8A is an enlarged plan view illustrating a part of a display
device.
Referring to FIG. 8A, pads PD-1 are shown by solid lines, and a
chip pad IP is shown by a dotted line.
The first width WT1 of the chip pad IP and the third width WT3-1 of
the first pad PD1-1 may be equal to each other. The fifth width WT5
of the second pad PD2 may be larger than the first width WT1 of the
chip pad IP and the third width WT3-1 of the first pad PD1.
The fourth width WT4-1 of the first pad PD1-1 may be less than the
second width WT2 of the chip pad IP. Therefore, the chip pad IP
exposed in the second direction DR2 with respect to the first pad
PD1-1 may be measured to determine whether the alignment is
correct.
FIG. 8B is an enlarged plan view illustrating a part of a display
device.
Referring to FIG. 8B, pads PD-2 are shown by solid lines, and a
chip pad IP is shown by a dotted line.
The third width WT3-2 of the first pad PD1-2 is less than the first
width WT1 of the chip pad IP and the fourth width WT4-2 of the
first pad PD1-2 is less than the second width WT2 of the chip pad
IP. Therefore, the chip pad IP exposed in the first direction DR1
and the second direction DR2 are measured based on the first pad
PD1-2 in order to measure whether the alignment is correct.
FIG. 8C is an enlarged plan view illustrating a part of a display
device.
Referring to FIG. 8C, pads PD-3 are shown by solid lines, and a
chip pad IP is shown by a dotted line.
The third width WT3-3 of the first pad PD1-3 may be less than the
first width WT1 of the chip pad IP and the fifth width WT5 of the
second pad PD2. The fourth width WT4-3 of the first pad PD1-3 may
be greater than the second width WT2 of the chip pad IP. The chip
pad IP exposed in the first direction DR1 with respect to the first
pad PD1-3 may be measured to determine whether the alignment is
correct.
FIG. 8D is an enlarged plan view illustrating a part of a display
device.
Referring to FIG. 8D, pads PD-4 are shown by solid lines, and a
chip pad IP is shown by a dotted line.
The third width WT3-4 of the first pad PD1-4 is equal to the fifth
width WT5 of the second pad PD2 and is greater than the first width
WT1 of the chip pad IP. The fourth width WT4-4 of the first pad
PD1-4 may be greater than the second width WT2 of the chip pad IP.
The chip pad IP exposed in the second direction DR2 with respect to
the first pad PD1-4 may be measured to determine whether the
alignment is correct.
FIG. 9A is a plan view of a pad part according to an exemplary
embodiment of the inventive concept.
Referring to FIG. 9A, the first pad part PAD1-2 may include a
plurality of pads PD-5. The plurality of pads PD-5 may all have a
rectangular shape.
The pads PD-5 may include a first pad PD1-5 and a second pad PD2-1.
The first pad PD1-5 may be disposed in the alignment area ALA and
the second pad PD2-1 may be disposed in the connection area
CNA.
Although it is shown in FIG. 9A that all pads arranged at the
outermost among the plurality of pads PD-5 are the second pads
PD2-1, the first pad PD1-5 and the second pad PD2-1 among the
plurality of pads PD-5 may be disposed at the outermost.
FIG. 9B is a plan view of a pad part according to an exemplary
embodiment of the inventive concept.
Referring to FIG. 9B, the first pad part PAD1-3 may include a
plurality of pads PD-6. The plurality of pads PD-6 may be defined
by first-row pads PDM1, which are arranged along the second
direction DR2, and second-row pads PDM2, which are arranged along
the second direction DR2 and partially overlap the first-row pads
PDM1 in the second direction DR2. The first-row pads PDM1 and the
second-row pads PDM2 may be alternately arranged sequentially along
the first direction DR1.
The first-row pads PDM1 and the second-row pads PDM2 may not
overlap each other in the first direction DR1. One first-row pad
PDM1 and one second-row pad PDM2 may be alternately arranged along
the second direction DR2.
The pads PD-6 may include a first pad PD1-6 and a second pad PD2-2.
The first pad PD1-6 is arranged in a first alignment area ALA-1 or
a second alignment area ALA-2 and the second pad PD2-2 is arranged
in the connection area CNA.
Although the first alignment area ALA-1 and the second alignment
area ALA-2 are shown in FIG. 9B, any one of the first alignment
area ALA-1 and the second alignment area ALA-2 may be omitted.
The first pad PD1-6 disposed in the first alignment area ALA-1 may
be arranged to be parallel along the second direction DR2. The
first pad PD1-6 disposed in the second alignment area ALA-2 may be
arranged in a diamond shape. The arrangement form of the first pad
PD1-6 is exemplarily shown but may be modified to different forms
other than the shown arrangement form.
According to an embodiment of the inventive concept, the size of a
pad of a display panel for measuring the alignment is smaller than
the size of a chip pad of a driving chip. Therefore, it is possible
to easily check whether a driving chip is properly aligned on a
display panel on the rear surface facing the upper surface of the
display panel where the driving chip is mounted.
Although certain exemplary embodiments and implementations have
been described herein, other embodiments and modifications will be
apparent from this description. Accordingly, the inventive concept
is not limited to such embodiments, but rather to the broader scope
of the presented claims and various obvious modifications and
equivalent arrangements.
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